Boiler-feed control.



B. F. PRIZZELL. BOILBB. FEED CONTROL. 'unmnmn H Lnn Ju. 2a, 1912.

Patented 1m31, 1914,

'n RO limllm l Il 'UNITED sTATEs :PATENT oFFioE.

BERNARD F. FBIZZELL, 0F BALTIMORE, MARYIAND.

BOILER-FEED CONTROL.

Specication of Letters Patent.

Patented Mar. 31, 1914.

Application filed January 23, 1912.v Serial No. 672,821.

To all 'whom t may conc-cm Be it known that I, BERNARD F. FRIZZELL, a citizen of the United States, residing at Baltimore, State of Maryland, have invented certain new and useful Improvements inl lreadily responds to changes in temperature,

this feature, namely, inclosing the fluid in a continuous practically airtight expansible box, positively obviating the disadvantages and' annoyances caused by vaporization of the usual fluids employed in devices of this character. v

With the above object in view the invention consists of certain novel detailsof construction and combination of parts hereinafter fully described and claimed, it being understood that various modifications may be made in the minor details of construction within the scope of the appended claims.

In the accompanying drawing forming part of this specification, the figure is a longitudinal sectional view through the expans'ble box chamber and feed water controlling mechanism.

Referring now to the drawing in which like characters of reference designate similar parts, 10 designates a boiler having its steam and water spaces connected respectively by pipes 11 and 12 with a water and steam chamber 13 located at the average or normal water line level of the boiler. The chamber 13 is formed in the lower part of the casing 14, the casing being closed by a cover 15 which forms a practically airtight chamber 16 in the top of the casing, both chambers being separated by a heat conducting partition /17.

Within the chamber 16 I arrange an expansible box 18 in the nature of a hollow disk formed of elastic or resilient material, the hollow disk or box being filled with -an expansible liquid of any character 'which will respond quickly to changes in temperature. The box is hermetically sealed whereby to prevent entry of air or escape of the such as contents. The cover is provided with a central bearing 19 in which is slidably fitted a piston 20, .the head of the piston bearing against the top of the expansible box and being yieldingly held in thisl position through the instrumentality of a helical spring 21 which bears upon the piston head and end wall of the bearing as clearly shown.

As the water levelin t-he boiler fluctuates the boiler steam and water alternately fill the chamber 13. It iS well known that water communicating with a boiler, but cut i off from circulation, becomes cold, and therefore when the chamber 13 is illed with water the casing 14 is comparatively cool. When the water level in the boiler falls below the chamber 13 the latter is filled with fresh steam which as soon as it condenses settles in the chamber, the chamber in this' manner being heated by the fresh steam. During such heating of the chamber there will be a resultant expansion of the expansible box 18.

the chamber. at low water will cause an increase of temperature in the chamber 16 with a resultant expansion ofthe-expansible box. During such expansion the piston will be raised against the tension of the spring, and through the instrumentality of mechanism to be presently-"ilesoribed, cause the water supply in the boiler to be The presence .of steam in will replenished. When this takes place water 'f will again enter the chamber 13 with a resultant decrease of temperature in the chamber 16 and contraction of the box 18, and

during such movement of the box thel piston will be returned to its initial position by the spring 21 and the .water supply controlling mechanism returnedto inactive position.

The water supply controlling mechanism includes a valve casing 22,' there being spaced ports 23 and 24 on one side of the casing and a port 25 on the opposite side of the casing intermediate these ports. valve stem 26'is mounted within the casing having a plug valve 27. A connecting rod 28 is adjustably secured to the piston rod 20 and is secured to the valve stem 26 as shown. It will be seen that when the expansible box 18 is in quiescent position, the plug valve 27 is in such a position 'as to unseal the port 25 and to permit of communication of this port with the port 24. Upon expansion of the box 18, the plug valve 27 will be moved to such a position as to. cut off comphragm, the piston stem 32 entering a Valvel casing 33 interposed in a steam pipe 34 and being equipped with a valve 35 adapted to open and close the passage in the steam pi e. The'steam pipe leads to the steam cylin er' 36 ofl a pump 37 having a supply pipe 38 which leads to any suitable water supply, and va feed pipe 39 which leads .into the water vspace of the boiler.

The port 23 of the Valve casing 22 is connected 1n any suitable manner with a water suppl;7 under pressure, preferably' a city hydrant. Now when the expansible box is in quiescent position, and the plug valve 27 in such a position to unseal the port 25 and to permit of communication between this port and the port 24, which latter 1t may be said is simply a drain, water may back through the pipe 29 and relieve the diaphragm 30 from pressure so that the valve 35 closes'the steam pipe 34. 0n the'other hand when the plug valve 27 is moved to such a position as to cut ofi'- communication between the ports 24 and 25 and to establish communication between the ports 25 and 23,k upon expansion of the expansible box, water under city pressure. will flow through the water pipe 29` and act upon the diaphragm 30 so as to cause the latter to move the valve 35 to open position and 'permit of the pas-v -sageuof steam through they steam pipez for actuating the'pump. The pump will supply water to the boiler until the normal supply or inother words the normal water level is reached whereupon the valve 35 will -be closed as above described to stop the pump. What is claimed, isg- 1. In a feed water regulator, the combinalating device controlled by the movement of,

the wall of the container independently of the walls ofthe chamber.

2. In a thermostatic regulator, the combination with a fluid' containing chamber, of

a container consisting of a closed receptacle without pipe connections and having a re'-v silient wall, and having permanently sealed therein a material whichl is cxpansible by heat, a regulating device whose movements are'controlled by the movements of a wall of the container and means for supporting- `said container in a position exposed to the vheat of the fluid in said chamber, but sepan rated therefrom by a substantially rigid wall.

In testimony whereoffI aiiix vmy signature, in. presence ofy two witnesses.

' BERNARD F. Witnesses:

GEO.' H. CHANDLEE, FRANCISy BOYLE.'

FRIZZELL. 

